Fisica e Matematica (Italia)

Question 1

A mill’s paddlewheel performs 3 rotations per minute. What is its frequency of motion?

A. (1/60) Hz
B. (1/30) Hz
C. (1/90) Hz
D. (1/20) Hz
E. (1/50) Hz

Answer 1

D. (1/20) Hz

Question 2

For a normal washing cycle, a dishwasher, powered by the 220 V household network, consumes 3.3 kW. What average current circulates inside it during washing?

A. 15 A
B. 66,700 mA
C. 0.015 A
D. 726 mA
E. 0.066 A

Answer 2

A. 15 A

Question 3

For an isosceles triangle, which of the following statements is false?

A. It can be equilateral
B. It can be inscribed in a circumference
C. It has two angles that are congruent with each other
D. It can have a 180˚ angle
E. The Pythagorean Theorem may apply

Answer 3

D. It can have a 180˚ angle

Question 4

A train is leaving the station at a speed of 10 m/s. A passenger onboard is walking towards the locomotive at a speed of 1 m/s. What is the speed of the passenger with respect to the station?

A. 1 m/s
B. 11 m/s
C. 9 m/s
D. 10 m/s
E. 12 m/s

Answer 4

B. 11 m/s

Question 5

In uniform circular motion:

A. the acceleration vector is null
B. the centripetal acceleration is cancelled out
C. the velocity is perpendicular to the trajectory at all times
D. the tangential acceleration is constant and greater than or less than zero, depending on the direction of the motion
E. the velocity vector and the acceleration vector are perpendicular to each other at all times

Answer 5

E. the velocity vector and the acceleration vector are perpendicular to each other at all times

Question 6

A force causes an object to shift by 5m. if the work done by this force is equal to 125 J, what is the value of the component of the force parallel to the shift?

A. -625 N
B. 25 N
C. it is impossible to find it without knowing the component of the force orthogonal to the shift
D. 625 N
E. -25 N

Answer 6

B. 25 N